Katie Biber, center, former general counsel for Mitt Romney, and Steven Siger, right, who worked for

Christina House / For The Times

SAN FRANCISCO-CA-MARCH 28, 2017: Katie Biber, center, former general counsel for Mitt Romney, and Stephen Siger, right, who worked for President Obama, are now attorneys at Thumbtack in San Francisco. (Christina House / For The Times)

SAN FRANCISCO-CA-MARCH 28, 2017: Katie Biber, center, former general counsel for Mitt Romney, and Stephen Siger, right, who worked for President Obama, are now attorneys at Thumbtack in San Francisco. (Christina House / For The Times) (Christina House / For The Times)

SAN FRANCISCO-CA-MARCH 28, 2017: Katie Biber, center, former general counsel for Mitt Romney, and Stephen Siger, right, who worked for President Obama, are now attorneys at Thumbtack in San Francisco. (Christina House / For The Times)